and Greg Campbell of Castle Research Associates, "An Engineering Approach to the Correction of
Rotational Flow Calculations for Single Screw Extruders," shows the effect of the shape factor for polymers with various power-law coefficients (Fig.
The
rotational flow field in a channel of constant cross-section with a lateral burning surface is given as follows 17]:
Exact solutions for the
rotational flow of generalized Maxwell fluids in a circular cylinder, Math.
The specific
rotational flow rate for the screw was calculated at 6.4 kg/(h rpm).
The flow parameter has values between
rotational flow where [lambda] = -1, simple shear where [lambda] = 0, and planar extensional flow where [lambda] = 1.
The time required for blending is reduced significantly by top-to-bottom flow compared with
rotational flow. This angled mixer position is the most effective for mixing and blending applications and should be used in most situations that do not specifically involve drawing material from the surface.
Kamran ,On the unsteady
rotational flow of a generalized Maxwell fluid through a circular cylinder, Arch.
The parameter [S.sub.f] ranges from 0 for pure
rotational flow to infinite for pure elongational flow (for simple shear flow [S.sub.f] = 1).
It was thought that the
rotational flow of the compressed mixture in the discharge screw was being maintained past the end of the screw.
While at low shear rates in the steady
rotational flow the concentration dependence of viscosity is in agreement with the trend observed on the tube rheometry, the data at shear rates above 0.2 [s.sup.-1] do not appear to show any strong concentration effects.